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DetectionMethod.METHOD_D enum 추가 + when 분기 + UI 4-버튼. detection + BV 둘 다 Method D 가능. appshare Python pipeline 일치. - enum DetectionMethod: METHOD_C → +METHOD_D - when (method) METHOD_D 분기: MethodDRunner.detectMultichannel → allWalls - BV path: detectionIsMethodD 일 때 recompute 생략 - Dev panel Detection toggle 3-button → 4-button (D 보라색) Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>